Acura RL. Manual - part 66

DTC P0983 (60): ADVANCED DIAGNOSTICS

DTC P0983: OPEN IN SHIFT SOLENOID VALVE D CIRCUIT

Fig. 219: Shift Solenoid Valve D Circuit Diagram

Fig. 220: Shift Solenoid Valve Driving Signal Combination Table

General Description

When shift solenoid valves A and D are turned ON, the hydraulic pressure circuit opens. When shift
solenoid valves B and C are turned OFF, the hydraulic pressure circuit opens. The hydraulic pressure circuit
supplies/discharges hydraulic pressure to/from each clutch according to the combination of the ON/OFF
status of those valves and the shift valves. The powertrain control module (PCM) commands the driver
circuit to turn on the shift solenoid valve. The circuit diagnoses malfunctions such as a circuit short or open,
and sends back a return signal during the PCM's command. A malfunction is detected when the return signal
does not match the PCM command to turn OFF the shift solenoid valve, and a DTC is stored.

Monitor Execution, Sequence, Duration, DTC Type, OBD Status

MONITOR DESCRIPTION CHART

Execution

Continuous

Sequence

None

Duration

1 second or more

2007 Acura RL

2007 ENGINE PERFORMANCE Advanced Diagnostics - RL

Friday, June 05, 2009 2:32:06 PM

Enable Conditions

ENABLE CONDITIONS

Malfunction Threshold

The return signal does not match the command to turn OFF shift solenoid valve D for at least 1 second.

Driving Pattern

Start the engine, shift to the N position, and wait for at least 1 second.

Diagnosis Details

Conditions for illuminating the MIL

When a malfunction is detected, the MIL comes on and the DTC and the freeze frame data are stored in the
PCM memory.

Conditions for clearing the MIL

The MIL will be cleared if the malfunction does not recur during three consecutive trips in which the
diagnostic runs.

The MIL, the DTC, and the freeze frame data can be cleared by using the scan tool Clear command or by
disconnecting the battery.

DTC P1077 (106): ADVANCED DIAGNOSTICS

DTC P1077: INTAKE MANIFOLD TUNING (IMT) VALVE STUCK IN HIGH RPM POSITION

DTC Type

One drive cycle, MIL ON, D indicator blinks

OBD Status

PASSED/FAILED/NOT COMPLETED (STILL TESTING)

Condition

Minimum

Maximum

Battery voltage

11.0 V

No active DTCs

P0973, P0974, P0982

2007 Acura RL

2007 ENGINE PERFORMANCE Advanced Diagnostics - RL

Friday, June 05, 2009 2:32:06 PM

Fig. 221: Intake Manifold Tuning Sensor Output Characteristics

General Description

The intake manifold tuning (IMT) system controls engine output by selecting either long or short intake
runner lengths. The system consists of the IMT valve, the IMT actuator, and the powertrain control module
(PCM). The IMT actuator is attached to the intake manifold and it includes the motor and the Hall-effect-IC
position sensing unit. The PCM actuates the motor, which operates the IMT valve. When the IMT valve is
closed, the long runner is selected, increasing torque at low engine speed. When the IMT valve is open, the
short runner is selected, increasing torque at high engine speed. A Hall-effect-IC position sensing unit is
integrated with the motor to provide precise open/close feedback to the PCM. The IMT actuator sends a
long runner return signal to the PCM when the IMT valve is closed, and it sends a short runner return signal
when the IMT valve is open.

If the PCM receives no closed return signal when it sends a close command, or if it receives no open return
signal when sending an open command to the IMT actuator, for a specified time, it detects a malfunction
and stores a DTC.

Monitor Execution, Sequence, Duration, DTC Type, OBD Status

MONITOR DESCRIPTION CHART

Execution

Once per driving cycle

2007 Acura RL

2007 ENGINE PERFORMANCE Advanced Diagnostics - RL

Friday, June 05, 2009 2:32:06 PM

Enable Conditions

ENABLE CONDITIONS

Malfunction Threshold

When the PCM sends a close (long runner) command, no long runner return signal is received for at least 7
seconds.

Driving Pattern

1. Start the engine. Let it idle until the radiator fan comes on.

2. Let the engine idle for at least 7 seconds.

Diagnosis Details

Conditions for illuminating the MIL

When a malfunction is detected during the first drive cycle, a Temporary DTC is stored in the PCM
memory. If the malfunction recurs during the next (second) drive cycle, the MIL comes on and the DTC and
the freeze frame data are stored.

Conditions for clearing the MIL

The MIL will be cleared if the malfunction does not recur during three consecutive trips in which the
diagnostic runs.

The MIL, the DTC, the Temporary DTC, and the freeze frame data can be cleared by using the scan tool
Clear command or by disconnecting the battery.

DTC P1078 (106): ADVANCED DIAGNOSTICS

DTC P1078: INTAKE MANIFOLD TUNING (IMT) VALVE STUCK IN LOW RPM POSITION

Sequence

None

Duration

7 seconds or more

DTC Type

Two drive cycles, MIL ON

OBD Status

PASSED/FAILED/NOT COMPLETED (STILL TESTING)

Condition

Minimum

Maximum

Intake air temperature

5°F (-15°C)

Engine speed

3,800 rpm

Battery voltage

10.5 V

No active DTCs

P0107, P0108, P0112, P0113, P0117, P0118, P0563, P1109,
P1128, P1129, P2227, P2228, P2229

2007 Acura RL

2007 ENGINE PERFORMANCE Advanced Diagnostics - RL

Friday, June 05, 2009 2:32:06 PM

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